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Fosi Audio V3 Mono Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 14 1.9%

  • 2. Not terrible (postman panther)

    Votes: 24 3.2%

  • 3. Fine (happy panther)

    Votes: 141 18.9%

  • 4. Great (golfing panther)

    Votes: 569 76.1%
  • Total voters
    748
Jost Buergi said:
I got my amp yesterday and am a bit disappointed because the RCA gain switch on the back still states 31/25 dB. I liked that Fosi went for 25/19 dB instead and when they wrote "We changed the output a little down to avoid Problems, the RCA input has been lowered by 6dB" almost 4 months ago.

Purchase was made from Fosi's german ebay shop. Any ideas when their local warehouse will sell current production units, or which shops do?
Click to expand...
You can also check which version you have yourself.
See post #1.062
 
Hey, just received my 2 mono v3 from amazon. I've got the 25/19 db and one power supply 48v/10a with a split.

It is a step up from the v3 stereo. Very happy with the sound. BUT, unfortunatly, the blocks make weird noises un my speaker when i switch on. Besides, there is a click noise too and a plop in the speakkers too.

I tried :
* to plug the power supply directly in the wall. Same strange noises.
* So i used the power supply from the v3 stereo(48v/5a). First, directly on one mono amp. Total silence ! No mote click nor weird sounds.
Then i used the split and again, total silence.

I didn't have time to test sound. Will do it later.
So it looks like the power supply 47v/10a is faulty.
Should i try something else before returning the package ?
 
MajorTom said:
Hey, just received my 2 mono v3 from amazon. I've got the 25/19 db and one power supply 48v/10a with a split.

It is a step up from the v3 stereo. Very happy with the sound. BUT, unfortunatly, the blocks make weird noises un my speaker when i switch on. Besides, there is a click noise too and a plop in the speakkers too.

I tried :
* to plug the power supply directly in the wall. Same strange noises.
* So i used the power supply from the v3 stereo(48v/5a). First, directly on one mono amp. Total silence ! No mote click nor weird sounds.
Then i used the split and again, total silence.

I didn't have time to test sound. Will do it later.
So it looks like the power supply 47v/10a is faulty.
Should i try something else before returning the package ?
Click to expand...
Not totally clear ...'used the split and again, total silence' ? ...

do you have the split cable with a Fosi filter? I did not have issues in my system just using the splitter cable, but Fosi sent out filters complete with splitter cable that went between the 10A supply and the 2 V3 Monos to address certain issues I suspect like this.
 
Sorry I was not clear. By total silence, i mean no clicking nor weird sounds in my speakers. Kind of interference noise are no more with the other power supply from my v3 stereo. But i have music !

So, the power supply is plugged in the fosi "filter" then the dual cable to connect to each mono amp. The classic combo for sale on amazon.
1000016834.jpg
 
MajorTom said:
Sorry I was not clear. By total silence, i mean no clicking nor weird sounds in my speakers. Kind of interference noise are no more with the other power supply from my v3 stereo. But i have music !

So, the power supply is plugged in the fosi "filter" then the dual cable to connect to each mono amp. The classic combo for sale on amazon.
View attachment 486112
Click to expand...
If you have noise with this combination then there may well be a problem with the 10A supply. All that I can confirm with you is that I have this combination and I have not had any noise issues.
 
Hey.
Looking at these to power my 84db/w B&W CM1s instead of my failing Yamaha receiver.
Any thoughts and advice?
Im using a Topping DX5 II as a Dac atm, but can also be used as a preamp.
 
Esp3n89 said:
Hey.
Looking at these to power my 84db/w B&W CM1s instead of my failing Yamaha receiver.
Any thoughts and advice?
Im using a Topping DX5 II as a Dac atm, but can also be used as a preamp.
Click to expand...
Seems like a plan. may as well use the balanced connectors, and yeah, use the DX5 as a volume control/pre-amp.

And seems like might be best to order with 2x separate power supplies rather than the pack with the single 10A power supply and filter - seems enough people have had issue with that that it might be pertinent to avoid.

They still seem like perhaps the best value high performance amps with PFFB.

I'm happy with mine, and no issues. but it's only been a few months. sure do hope many many years of continued "no issues".
 
jEDGEc0m said:
Seems like a plan. may as well use the balanced connectors, and yeah, use the DX5 as a volume control/pre-amp.

And seems like might be best to order with 2x separate power supplies rather than the pack with the single 10A power supply and filter - seems enough people have had issue with that that it might be pertinent to avoid.

They still seem like perhaps the best value high performance amps with PFFB.

I'm happy with mine, and no issues. but it's only been a few months. sure do hope many many years of continued "no issues".
Click to expand...
That’s exactly my setup and I am more than happy with it! Works perfectly.
 
jEDGEc0m said:
Seems like a plan. may as well use the balanced connectors, and yeah, use the DX5 as a volume control/pre-amp.

And seems like might be best to order with 2x separate power supplies rather than the pack with the single 10A power supply and filter - seems enough people have had issue with that that it might be pertinent to avoid.

They still seem like perhaps the best value high performance amps with PFFB.
I'm happy with mine, and no issues. but it's only been a few months. sure do hope many many years of continued "no issues".Yes, I do similar as I like balanced connections and having a physical volume knob in the replay chain. My logic in buying the single 10A supply was that it should be sufficient but if it wasn't I wouldn't mind buying a second 10A supply - whereas if 2x5W proved insufficient I would object to throwing them away and buying a couple of 10s - however 1x10A was absolutely fine so likely it made no difference which of the two options I had actually picked.
Click to expand...
 
jEDGEc0m said:
Seems like a plan. may as well use the balanced connectors, and yeah, use the DX5 as a volume control/pre-amp.

And seems like might be best to order with 2x separate power supplies rather than the pack with the single 10A power supply and filter - seems enough people have had issue with that that it might be pertinent to avoid.

They still seem like perhaps the best value high performance amps with PFFB.

I'm happy with mine, and no issues. but it's only been a few months. sure do hope many many years of continued "no issues".
Click to expand...
I see they sell also singles with 1 10amp power supplie each. And point in that or is 5amp all thats needed?
 
Esp3n89 said:
I see they sell also singles with 1 10amp power supplie each. And point in that or is 5amp all thats needed?
Click to expand...

Very little - if you have speakers that dip to very low impedance levels (Say less than 3ohm), then the 10 amp supply will be able to power those a little bit better than the 5A - perhaps.
 
Esp3n89 said:
I see they sell also singles with 1 10amp power supplie each. And point in that or is 5amp all thats needed?
Click to expand...
Yeah, as antcollinet said, probably not.

I will confess that since I needlessly wanted to put 48V power supplies on existing Fosi V3 Stereo amps I already had that came with 32V power supplies - So I got 2x Mean Well LRS-200N2-48V.

LRS-200N2-MEAN WELL Switching Power Supply Manufacturer

MEAN WELL is one of the world's few standard power supply mainly professional manufacturers, covering 0.5 to 25,600W products are widely used in industrial control, medical and other fields, in line with international safety certification, short delivery of spot inventory.
www.meanwell.com

They are fanless, claim 200W/4.4A - but I understand they can output double that for "short" periods of time - which are actually pretty long periods of time in musical terms.
I doubt I'm ever pushing them. But I though they were well priced, and should be high quality, and I don't mind the metal boxes.
 
Mark185 said:
There is another MEAN WELL power supply that is very suited for these amplifiers if you can find it in the US. Digi Key sells it but has no stock right now.


They have a lower power version in stock that is also a good candidate and I may buy one:

Click to expand...
But these open frame designs need to be put into a suitable enclosure for safe operation. Not worth the hassle unless you are building a complete amp and putting everything in one enclosure.

In any case, why buy these meanwell PSU's rather than use the sock supplies?
 
To each his own. I like tinkering and doing DIY stuff. Putting them in a nice enlcosure is not a big deal to me. The cost probably ends up being $70-80 for the 300 watt power supply and enclosure so no cost savings over off the shelf 10 amp 48 volt supply. The advantage of DIY is I can put two 300 watt supplies in a common metal enclosure and run power to 2 Fosi V3 monos that is superior to the 48 volt 5 amp supplies they offer.
 
antcollinet said:
Superior in what way?
Click to expand...
With cooling fan in an enclosure, the 300 watt supply can do ~6.25 amps with some capability to provide more power for short bursts. Dedicated power supplies for each V3 mono will outperform the 48 volt power supply Fosi ships with them.
 
Mark185 said:
With cooling fan in an enclosure, the 300 watt supply can do ~6.25 amps with some capability to provide more power for short bursts. Dedicated power supplies for each V3 mono will outperform the 48 volt power supply Fosi ships with them.
Click to expand...

First - any PSU with a fan is a bad think as far as I am concerned. Secondly, from the measurements here, the V3 Mono can already perform at the limit of the chip at 48V. You are not going to get more from it with a beefier supply. This also tells us the stock supply is able to give more than the rated 5 amps at least for the duration of the full power testing.
 
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